这个所谓的“双五”规定于1974年生效，但受到了人们的广泛抨击和无视，最终在1993年被废止。
Signed into law in 1974, the so-called "Double Nickel" was widely reviled and widely ignored before it was finally repealed in 1993.
有五双可供选择。
一些电缆是双芯的，其他的可能有五个、六个、十二个甚至更多芯。
Some cables have two wires while others may have five, six, twelve, or more wires.
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